You’re working at your computer when all of the sudden – BAM! – you get a pop-up notification that your PC is infected with a virus and you must "click here" to run a scan or install antivirus software. This is a common scareware tactic used by hackers to get you to click and download a virus. (You should know that IT consultancies would never deliver that type of pop-up to you!)
Often it will appear to be a system alert or a Microsoft operating system alert. Regardless of how legitimate it looks, NEVER click on the site or the pop-up. The safest thing to do is close your browser; do not click on the X, "Close" or "Cancel" button in the pop-up or on the site because clicking on anything on the page or pop-up will trigger a virus download. If that won’t work, bring up your task manager (hold Control + Alt + Delete on a PC and Command + Option + Esc to "Force Quit" on a Mac) and close the web browser or application where it appeared. Next, notify your IT department (us!) that this has happened so we can double-check with a legitimate scan if your computer was infected.